Add 0.15.1 blog post

[jonasrosland]

This will add the new 0.15.1 blog post by @johnSchnake

Signed-off-by: jonasrosland [email protected]

[codecov-io]

Codecov Report

Merging #828 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #828      +/-   ##
==========================================
+ Coverage   44.55%   44.61%   +0.06%     
==========================================
  Files          76       76              
  Lines        4624     4624              
==========================================
+ Hits         2060     2063       +3     
+ Misses       2431     2430       -1     
+ Partials      133      131       -2

Impacted Files	Coverage Δ
cmd/sonobuoy/app/status.go	57.14% <0%> (-2.2%)	⬇️
pkg/plugin/aggregation/aggregator.go	83.2% <0%> (+4%)	⬆️

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